# 2719

This number is a prime.

In 1917, Ramanujan gave a short
list of odd numbers which cannot be written as *x*^{2} + *y*^{2} + 10*z*^{2}. Eighty years later it is was shown that 2719 is surely the largest such number (GRH). Did you notice 2719 is a permutation of the Hardy-Ramanujan number? [Ono1997] [Beedassy]

(There is one curio for this number that has not yet been approved by an editor.)

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